Oscillation circuit, chip and electronic device
Through the design of the mirror amplification module and feedback module, the problem of inconsistent duty cycle of the clock signal in the oscillation circuit is solved, which improves working reliability and reduces chip area.
Patent Information
- Application Number
- CN202510584454.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2025-08-12
AI Technical Summary
In the existing oscillation circuit, due to the influence of feedback resistance, the duty cycle of the clock signal is inconsistent, which reduces the working reliability.
Using a mirror amplification module and a feedback module, the mirror amplifies the current of the second end of the crystal oscillator and supplies it to the first end of the crystal oscillator. The feedback module provides a bias voltage during the start-up stage and reduces the voltage difference between the first end and the second end of the crystal oscillator during the maintenance stage.
The duty cycle of the clock signal output after comparing the shaping is optimized, the working reliability of the oscillation circuit is improved, and the chip area occupation is reduced.
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Figure CN120474492A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic circuits, and in particular to an oscillator circuit, a chip, and an electronic device. Background Art
[0002] The oscillator circuit is used to drive the crystal oscillator to output the corresponding clock signal after comparison and shaping. The oscillator circuit usually uses a megohm-level feedback resistor connected to both ends of the crystal oscillator to provide the required bias voltage.
[0003] However, due to the influence of various factors, some parameters of the clock signal may deviate from the designed values, thereby reducing the working reliability of the oscillation circuit. Summary of the Invention
[0004] In view of the above problems, the embodiments of the present application provide an oscillator circuit, a chip, and an electronic device to alleviate the above technical problems.
[0005] In a first aspect, an embodiment of the present application provides an oscillation circuit, which includes a mirror amplification module and a feedback module. The mirror amplification module is used to amplify the current at the second end of the crystal oscillator and provide it to the first end of the crystal oscillator; the feedback module is used to provide a bias voltage for the mirror amplification module in the starting stage, and to reduce the voltage difference between the first end and the second end of the crystal oscillator in the maintenance stage, and the voltage difference is less than the bias voltage.
[0006] In a second aspect, an embodiment of the present application further provides a chip comprising the above-mentioned oscillation circuit.
[0007] In a third aspect, an embodiment of the present application further provides an electronic device, which includes a device body and the above-mentioned oscillation circuit or chip provided in the device body.
[0008] The oscillation circuit, chip, and electronic device provided in the embodiments of the present application amplify the current at the second end of the crystal oscillator through a mirror amplifier module and provide the amplified current to the first end of the crystal oscillator. The feedback module provides a bias voltage for the mirror amplifier module during the starting phase. This not only provides a higher bias voltage for the mirror amplifier module during the starting phase to control the starting of the crystal oscillator, but also reduces the voltage difference between the first end and the second end of the crystal oscillator during the maintenance phase. This is beneficial for controlling the consistency between the voltage at the first end of the crystal oscillator and the voltage at the second end of the crystal oscillator, thereby optimizing the duty cycle of the clock signal output after comparison and shaping, thereby improving working reliability.
[0009] These and other aspects of the present application will become more readily apparent from the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0011] Figure 1 The figure shows a principle block diagram of the oscillation circuit provided in an embodiment of the present application.
[0012] Figure 2 The first principle block diagram of the feedback module is shown.
[0013] Figure 3 A first circuit principle diagram of the first feedback unit is shown.
[0014] Figure 4 A first circuit principle diagram of the second feedback unit is shown.
[0015] Figure 5 A second principle block diagram of the feedback module is shown.
[0016] Figure 6 A second circuit principle diagram of the first feedback unit is shown.
[0017] Figure 7 A second circuit principle diagram of the second feedback unit is shown.
[0018] Figure 8 shows a circuit schematic diagram of the third feedback unit.
[0019] Figure 9 The principle block diagram of the mirror amplification module is shown.
[0020] Figure 10 The figure shows a circuit schematic diagram of the oscillation circuit provided in an embodiment of the present application.
[0021] Figure 11 The figure shows a circuit diagram of the comparison shaping module provided in an embodiment of the present application.
[0022] Figure 12 A schematic diagram of the structure of the chip provided in an embodiment of the present application is shown.
[0023] Figure 13 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION
[0024] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.
[0025] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.
[0026] In the embodiments of the present application, it should be noted that, in this document, relational terms such as first and second, etc., are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.
[0027] Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.
[0028] In the description of the embodiments of this application, words such as "example" or "for example" are used to indicate an example, illustration, or description. Any embodiment or design described as "for example" or "for example" in the embodiments of this application is not to be construed as being preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to clearly present relative concepts.
[0029] In addition, in the embodiments of the present application, "plurality" refers to two or more. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two, or more. For example, "including at least one" means including one, two, or more, and does not limit which ones are included. For example, "including at least one of A, B, and C" means including A, B, C, A and B, A and C, B and C, or A, B, and C.
[0030] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.
[0031] The first electrode / first end of each transistor used in the embodiments of the present application is one of the source and the drain, and the second electrode / second end of each transistor is the other of the source and the drain. Since the source and drain of the transistor can be symmetrical in structure, the source and drain can be structurally indistinguishable, that is, the first electrode / first end and the second electrode / second end of the transistor in the embodiments of the present application can be structurally indistinguishable. For example, in the case where the transistor is a P-type transistor, the first electrode / first end of the transistor is the source, and the second electrode / second end is the drain; for example, in the case where the transistor is an N-type transistor, the first electrode / first end of the transistor is the drain, and the second electrode / second end is the source.
[0032] The feedback resistor in a classic Pierce oscillator circuit is coupled between the drain and gate of the amplifier transistor, providing a DC bias voltage for the amplifier transistor. The drain and gate voltages of the amplifier transistor are sinusoidal waves with opposite orientations. Ideally, the drain and gate of the amplifier transistor have the same DC voltage, so a comparison results in a clock signal with a 50% duty cycle.
[0033] However, in practical applications, the drain and gate of the amplifier transistor are connected to external load capacitors through the PAD terminals of the IO. A small amount of current will leak from the IO into the crystal oscillator, forming a voltage drop across the feedback resistor. The feedback resistor is usually in the megaohm (MΩ) level, which not only occupies a large chip area but also causes a DC voltage difference between the drain and gate of the amplifier transistor, thereby degrading the duty cycle of the output clock signal after comparison and shaping.
[0034] Based on the above analysis, the present invention provides an oscillator circuit 100. Figures 1 to 11 The oscillation circuit 100 uses a feedback module 30 composed of transistors to replace the feedback resistor, which not only effectively reduces the occupied area, but also improves the consistency between the first terminal voltage of the crystal oscillator Crl and the second terminal voltage of the crystal oscillator Crl, thereby optimizing the duty cycle of the clock signal CLK output after comparison and shaping, thereby improving working reliability.
[0035] The embodiment of the present application provides an oscillating circuit 100, such as Figure 1As shown, the oscillation circuit 100 includes a mirror amplification module 20 and a feedback module 30. The mirror amplification module 20 is used to amplify the current at the second end of the crystal oscillator Crl and provide it to the first end of the crystal oscillator Crl; the feedback module 30 is used to provide a bias voltage for the mirror amplification module 20 in the starting stage, and to reduce the voltage difference between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl in the maintenance stage, and the voltage difference is less than the bias voltage.
[0036] It can be understood that the oscillation circuit 100 provided in the embodiment of the present application amplifies the current at the second end of the crystal oscillator Crl through the mirror amplification module 20 and provides it to the first end of the crystal oscillator Crl. The feedback module 30 provides a bias voltage for the mirror amplification module 20 in the starting stage. Not only can a higher bias voltage be provided to the mirror amplification module 20 in the starting stage to control the oscillation of the crystal oscillator Crl, but also because the voltage difference between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl is reduced in the maintenance stage, it is beneficial to control the consistency between the voltage at the first end of the crystal oscillator Crl and the voltage at the second end of the crystal oscillator Crl, thereby optimizing the duty cycle of the clock signal CLK output after comparison and shaping, thereby improving the working reliability.
[0037] It should be noted that the first end of the mirror amplification module 20 is connected to the first end of the crystal oscillator Cr1 and the first end of the first capacitor CL1 via the first pad PAD1. The control end of the mirror amplification module 20 is connected to the second end of the crystal oscillator Cr1 and the first end of the second capacitor CL2 via the second pad PAD2. The second end of the first capacitor CL1, the second end of the second capacitor CL2, and the second end of the mirror amplification module 20 are all connected to the ground terminal GND. Here, XO is the voltage at the first end of the crystal oscillator Cr1, and XI is the voltage at the second end of the crystal oscillator Cr1.
[0038] In some embodiments, such as Figure 2 As shown, the feedback module 30 includes a first feedback unit 31 and a second feedback unit 32. The first feedback unit 31 is used to control the equivalent impedance between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl to be a first resistance value when the voltage of the first end of the crystal oscillator Crl is greater than the voltage of the second end of the crystal oscillator Crl in the maintenance stage; the second feedback unit 32 is used to control the equivalent impedance between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl to be a second resistance value when the voltage of the first end of the crystal oscillator Crl is less than the voltage of the second end of the crystal oscillator Crl in the maintenance stage; wherein the first feedback unit 31 and the second feedback unit 32 are also used together to control the equivalent impedance between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl to be a third resistance value in the starting stage, and the third resistance value is greater than either the first resistance value or the second resistance value.
[0039] It should be noted that the start-up phase is the period from when the crystal oscillator Crl is powered on to a stable state, and the maintenance phase is the period after the start-up phase when the oscillation frequency is stable. In this embodiment, the first feedback unit 31 and the second feedback unit 32 are used to jointly achieve a larger third resistance value. This provides sufficient bias voltage for the mirror amplifier module 20 during the start-up phase to meet the start-up conditions of the crystal oscillator Crl. In the maintenance phase, the first feedback unit 31 or the second feedback unit 32 is used to achieve a smaller first resistance value or a smaller second resistance value. This can reduce the voltage difference between X1 and XO, thereby maintaining the voltage across the crystal oscillator Crl. This optimizes the duty cycle of the clock signal CLK output after comparison and shaping, thereby improving operational reliability.
[0040] In some embodiments, such as Figure 3 As shown, the first feedback unit 31 includes a first transistor MP1 and a first intrinsic transistor NT1. The first electrode of the first transistor MP1 is connected to the second feedback unit 32, the second electrode of the first transistor MP1 is connected to the first end of the crystal oscillator Cr1 and the mirror amplification module 20, and the control electrode of the first transistor MP1 is connected to the second end of the crystal oscillator Cr1; the first electrode of the first intrinsic transistor NT1 is connected to the first electrode of the first transistor MP1 and the second feedback unit 32, the second electrode of the first intrinsic transistor NT1 is connected to the second end of the crystal oscillator Cr1, and the control electrode of the first intrinsic transistor NT1 is connected to the first end of the crystal oscillator Cr1.
[0041] It should be noted that each intrinsic transistor in the present application has a threshold voltage close to 0 and a relatively high on-resistance. Therefore, these intrinsic transistors can be turned on under the control of a small gate-source voltage difference. In order to make the impedance of the intrinsic transistor meet the negative resistance requirement, this can be achieved by increasing the channel length of the intrinsic transistor, for example, by connecting multiple unit intrinsic transistors in series.
[0042] Exemplarily, the first electrode, the second electrode and the control electrode of the first intrinsic transistor NT1 are respectively the source electrode, the drain electrode and the gate electrode of the first intrinsic transistor NT1 .
[0043] In some embodiments, such as Figure 4 As shown, the second feedback unit 32 includes a second transistor MP2 and a second intrinsic transistor NT2, wherein a first electrode of the second transistor MP2 is connected to the first electrode of the first transistor MP1 and the first electrode of the first intrinsic transistor NT1, a second electrode of the second transistor MP2 is connected to the second end of the crystal oscillator Cr1, and a control electrode of the second transistor MP2 is connected to the first end of the crystal oscillator Cr1; a first electrode of the second intrinsic transistor NT2 is connected to the first electrode of the second transistor MP2, a second electrode of the second intrinsic transistor NT2 is connected to the first end of the crystal oscillator Cr1, and a control electrode of the second intrinsic transistor NT2 is connected to the second end of the crystal oscillator Cr1.
[0044] It should be noted that, during the sustaining phase, when the voltage at the first terminal of the crystal oscillator Crl is less than the voltage at the second terminal of the crystal oscillator Crl, the second transistor MP2 and the second intrinsic transistor NT2 can be automatically triggered to be turned on synchronously. The sum of the on-resistance of the second transistor MP2 and the on-resistance of the second intrinsic transistor NT2 is the second resistance value. During the starting phase, the first intrinsic transistor NT1 and the second intrinsic transistor NT2 can be automatically triggered to be turned on synchronously. The on-resistance of the first intrinsic transistor NT1 and the on-resistance of the second intrinsic transistor NT2 is the third resistance value.
[0045] Exemplarily, the first electrode, the second electrode and the control electrode of the second intrinsic transistor NT2 are respectively the drain, the source and the gate of the second intrinsic transistor NT2 .
[0046] In summary, compared with the feedback resistor, the feedback module 30 composed of two transistors and two intrinsic transistors requires a smaller occupied area.
[0047] In some embodiments, such as Figure 5 As shown, the feedback module 30 includes a first feedback unit 31, a second feedback unit 32 and a third feedback unit 33. The first feedback unit 31 is used to control the equivalent impedance between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl to be a first resistance value when the voltage of the first end of the crystal oscillator Crl is greater than the voltage of the second end of the crystal oscillator Crl in the maintenance stage; the second feedback unit 32 is used to control the equivalent impedance between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl to be a second resistance value when the voltage of the first end of the crystal oscillator Crl is less than the voltage of the second end of the crystal oscillator Crl in the maintenance stage; the third feedback unit 33 is used to control the equivalent impedance between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl to be a third resistance value in the starting stage, and the third resistance value is greater than either the first resistance value or the second resistance value.
[0048] It should be noted that in this embodiment, a larger third resistance is achieved through the third feedback unit 33 to provide sufficient bias voltage for the mirror amplifier module 20 during the start-up phase to meet the start-up conditions of the crystal oscillator Cr1. Furthermore, a smaller first resistance or second resistance is achieved through the first feedback unit 31 or the second feedback unit 32 during the maintenance phase, thereby reducing the voltage difference between XI and XO, thereby maintaining consistency between the voltages across the crystal oscillator Cr1, optimizing the duty cycle of the clock signal CLK output after comparison and shaping, and thereby improving operational reliability. The first resistance can be equal to the second resistance, or the first resistance can be different from the second resistance.
[0049] In some embodiments, such as Figure 6As shown, the first feedback unit 31 includes a third transistor MP3 and a fourth transistor MN4, the second electrode of the third transistor MP3 is connected to the first end of the crystal oscillator Crl and the mirror amplification module 20, and the control electrode of the third transistor MP3 is connected to the second end of the crystal oscillator Crl; the first electrode of the fourth transistor MN4 is connected to the first electrode of the third transistor MP3, the second electrode of the fourth transistor MN4 is connected to the second end of the crystal oscillator Crl, and the control electrode of the fourth transistor MN4 is connected to the first end of the crystal oscillator Crl.
[0050] It should be noted that in the maintenance phase, when the voltage at the first terminal of the crystal oscillator Crl is greater than the voltage at the second terminal of the crystal oscillator Crl, the third transistor MP3 and the fourth transistor MN4 are synchronously turned on, and the sum of the on-resistance of the third transistor MP3 and the on-resistance of the fourth transistor MN4 is the first resistance.
[0051] In some embodiments, such as Figure 7 As shown, the second feedback unit 32 includes a fifth transistor MN5 and a sixth transistor MP6, wherein a first electrode of the fifth transistor MN5 is connected to a first end of the crystal oscillator Cr1, and a control electrode of the fifth transistor MN5 is connected to a second end of the crystal oscillator Cr1; a first electrode of the sixth transistor MP6 is connected to a second end of the crystal oscillator Cr1, a second electrode of the sixth transistor MP6 is connected to a second electrode of the fifth transistor MN5, and a control electrode of the sixth transistor MP6 is connected to a first end of the crystal oscillator Cr1.
[0052] It should be noted that in the maintenance phase, when the voltage at the first terminal of the crystal oscillator Crl is less than the voltage at the second terminal of the crystal oscillator Crl, the fifth transistor MN5 and the sixth transistor MP6 are turned on synchronously, and the sum of the on-resistance of the fifth transistor MN5 and the on-resistance of the sixth transistor MP6 is the second resistance.
[0053] In some embodiments, such as Figure 8 As shown, the third feedback unit 33 includes at least one third intrinsic tube and at least one fourth intrinsic tube. The at least one third intrinsic tube is connected in series between the first end and the second end of the crystal oscillator. The first electrode of each third intrinsic tube is connected to its own control electrode, the first electrode of a third intrinsic tube is connected to the first end of the crystal oscillator Crl or the second electrode of another third intrinsic tube, and the second electrode of a third intrinsic tube is connected to the second end of the crystal oscillator Crl or the first electrode of another third intrinsic tube; at least one fourth intrinsic tube is connected in series between the first end and the second end of the crystal oscillator. The first electrode of each fourth intrinsic tube is connected to its own control electrode, the first electrode of a fourth intrinsic tube is connected to the second end of the crystal oscillator Crl or the second electrode of another fourth intrinsic tube, and the second electrode of a fourth intrinsic tube is connected to the first end of the crystal oscillator Crl or the first electrode of another fourth intrinsic tube.
[0054] It should be noted that, during the oscillation startup phase, when the voltage at the first terminal of the crystal oscillator Crl is greater than the voltage at the second terminal of the crystal oscillator Crl, at least one third intrinsic transistor is triggered to turn on, and the sum of the on-resistances of the third intrinsic transistors is the third resistor. During the oscillation startup phase, when the voltage at the first terminal of the crystal oscillator Crl is less than the voltage at the second terminal of the crystal oscillator Crl, at least one fourth intrinsic transistor is triggered to turn on, and the sum of the on-resistances of the fourth intrinsic transistors is the third resistor.
[0055] Exemplarily, the first electrode, second electrode and control electrode of the third intrinsic transistor are respectively the drain, source and gate of the third intrinsic transistor. The first electrode, second electrode and control electrode of the fourth intrinsic transistor are respectively the drain, source and gate of the fourth intrinsic transistor.
[0056] When the third feedback unit 33 illustratively includes a third intrinsic transistor, a first electrode of the third intrinsic transistor is connected to its control electrode and a first terminal of the crystal oscillator Cr1, and a second electrode of the third intrinsic transistor is connected to a second terminal of the crystal oscillator Cr1.
[0057] When the third feedback unit 33 exemplarily includes multiple third intrinsic transistors, for example, a third intrinsic transistor NT3-1 and a third intrinsic transistor NT3-2, the first electrode of the third intrinsic transistor NT3-1 is connected to the control electrode of the third intrinsic transistor NT3-1 and the first end of the crystal oscillator Crl, the second electrode of the third intrinsic transistor NT3-1 is connected to the first electrode of the third intrinsic transistor NT3-2 and the control electrode of the third intrinsic transistor NT3-2, and the second electrode of the third intrinsic transistor NT3-2 is connected to the second end of the crystal oscillator Crl.
[0058] When the third feedback unit 33 illustratively includes a fourth intrinsic tube, the first electrode of the fourth intrinsic tube is connected to the control electrode of the fourth intrinsic tube and the second end of the crystal oscillator Crl, and the second electrode of the fourth intrinsic tube is connected to the first end of the crystal oscillator Crl.
[0059] When the third feedback unit 33 exemplarily includes multiple fourth intrinsic tubes, for example, a fourth intrinsic tube NT4-1 and a fourth intrinsic tube NT4-2, the first electrode of the fourth intrinsic tube NT4-1 is connected to the control electrode of the fourth intrinsic tube NT4-1 and the second end of the crystal oscillator Crl, the second electrode of the fourth intrinsic tube NT4-1 is connected to the first electrode of the fourth intrinsic tube NT4-2 and the control electrode of the fourth intrinsic tube NT4-2, and the second electrode of the fourth intrinsic tube NT4-2 is connected to the first end of the crystal oscillator Crl.
[0060] In summary, the feedback module 30 composed of four transistors and at least two intrinsic transistors also requires a smaller area than the feedback resistor.
[0061] In some embodiments, such as Figure 9As shown, the mirror amplification module 20 includes a mirror unit 21 and an amplification unit 22. The mirror unit 21 is connected to a first end of the crystal oscillator Crl and a first end of the amplification unit 22. The second end of the amplification unit 22 is connected to a second end of the crystal oscillator Crl.
[0062] It should be noted that the mirror unit 21 is used to provide a first current to the first end of the crystal oscillator Crl; the amplifying unit 22 is used to amplify the current at the second end of the crystal oscillator Crl and provide it to the first end of the crystal oscillator Crl.
[0063] In some embodiments, such as Figure 10 As shown, the mirror unit 21 includes a seventh transistor MP7, an eighth transistor MP8, and a current source A1. A first electrode of the seventh transistor MP7 is connected to the power supply terminal VDD and the first electrode of the eighth transistor MP8. A control electrode of the seventh transistor MP7 is connected to a second electrode of the seventh transistor MP7, a first end of the current source A1, and a control electrode of the eighth transistor MP8. A second end of the current source A1 is connected to the ground terminal GND. A second electrode of the eighth transistor MP8 is used to output a first current.
[0064] It should be noted that the seventh transistor MP7 and the eighth transistor MP8 form a mirror structure, and the current provided by the current source A1 can be output as a first current in proportion through the mirror structure to provide a driving current for the crystal oscillator Cr1.
[0065] In some embodiments, such as Figure 10 As shown, the amplifying unit 22 includes a ninth transistor MN9, a first electrode of the ninth transistor MN9 is connected to the second electrode of the eighth transistor MP8, a second electrode of the ninth transistor MN9 is connected to the ground terminal GND, and a control electrode of the ninth transistor MN9 is connected to the second terminal of the crystal oscillator Cr1.
[0066] It should be noted that the ninth transistor MN9 is used to amplify the signal at the second end of the crystal oscillator Cr1 and provide the signal to the first end of the crystal oscillator Cr1.
[0067] Figure 11 The circuit schematic diagram of the comparison and shaping module provided in the embodiment of the present application is shown. The oscillation circuit 100 may also include a comparison and shaping module, which is used to perform two-stage differential amplification on XI and XO and then use an inverter to shape the waveform of the clock signal CLK so that it is closer to the ideal waveform.
[0068] The transistors M36, M37, M38, M39, M40, and M41 form a first-stage differential amplifier for performing first-stage differential amplification on X1 and XO. The transistor M35 provides a fixed mirror current for the first-stage differential amplifier.
[0069] The transistor M31, the transistor M32, the transistor M33 and the transistor M34 constitute a second-stage differential amplifier for differentially amplifying the output signal of the first-stage differential amplifier to achieve two-stage differential amplification of XI and XO.
[0070] Transistor M42 and transistor M43 form a first inverter, transistor M44 and transistor M45 form a second inverter, and transistor M46 and transistor M47 form a third inverter. The first inverter, the second inverter, and the third inverter are sequentially connected in series to ultimately output a clock signal CLK.
[0071] The number of inverters is optional, and can be one inverter or multiple inverters connected in series to achieve a shaping effect. The clock signal CLK can also be output from the input or output of any inverter.
[0072] The embodiment of the present application further provides a chip 200, such as Figure 12 As shown, the chip 200 includes the aforementioned oscillating circuit 100. The chip 200 is also called an integrated circuit (IC), and the chip 200 may be, but is not limited to, a SOC (System on Chip) chip or a SIP (System in Package) chip.
[0073] It can be understood that since the chip 200 provided in the embodiment of the present application includes the above-mentioned oscillator circuit 100, it can also amplify the current at the second end of the crystal oscillator Crl through the mirror amplifier module 20 and provide it to the first end of the crystal oscillator Crl. The feedback module 30 provides a bias voltage for the mirror amplifier module 20 in the starting stage, which not only provides a higher bias voltage for the mirror amplifier module 20 in the starting stage to control the oscillation of the crystal oscillator Crl, but also reduces the voltage difference between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl in the maintenance stage. This is conducive to controlling the consistency between the voltage at the first end of the crystal oscillator Crl and the voltage at the second end of the crystal oscillator Crl, thereby optimizing the duty cycle of the clock signal CLK output after comparison and shaping, thereby improving working reliability.
[0074] The embodiment of the present application also provides an electronic device 300, such as Figure 13As shown, the electronic device 300 includes a device body and the above-mentioned oscillation circuit 100 or chip 200 provided in the device body. The electronic device 300 can be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a mobile power supply, a wireless charger, a fast charger, a car charger, an adapter, a display, a USB (Universal Serial Bus) docking station, a stylus, a true wireless headset, a car central control panel, a car, a smart wearable device, a mobile terminal, and a smart home device. Smart wearable devices include, but are not limited to, smart watches, smart bracelets, and cervical massagers. Mobile terminals include, but are not limited to, smart phones, laptops, tablet computers, and POS (point of sales terminals). Smart home devices include, but are not limited to, smart sockets, smart rice cookers, smart sweepers, and smart lights.
[0075] It can be understood that since the electronic device 300 provided in the embodiment of the present application includes the above-mentioned oscillator circuit 100 or chip 200, it can also amplify the current at the second end of the crystal oscillator Crl through the mirror amplification module 20 and provide it to the first end of the crystal oscillator Crl. The feedback module 30 provides a bias voltage for the mirror amplification module 20 in the starting stage, which not only provides a higher bias voltage for the mirror amplification module 20 in the starting stage to control the oscillation of the crystal oscillator Crl, but also because the voltage difference between the first end of the crystal oscillator Crl and the second end of the crystal oscillator Crl is reduced in the maintenance stage, which is conducive to controlling the consistency between the voltage at the first end of the crystal oscillator Crl and the voltage at the second end of the crystal oscillator Crl, thereby optimizing the duty cycle of the clock signal CLK output after comparison and shaping, thereby improving the working reliability.
[0076] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.
Claims
1. An oscillation circuit, characterized in that: The oscillation circuit comprises: a mirror amplification module, configured to amplify the current at the second end of the crystal oscillator and provide the amplified current to the first end of the crystal oscillator; A feedback module is used to provide a bias voltage for the mirror amplification module in the starting phase and reduce the voltage difference between the first end of the crystal oscillator and the second end of the crystal oscillator in the maintaining phase, wherein the voltage difference is less than the bias voltage.
2. The oscillation circuit according to claim 1, wherein The feedback module includes: a first feedback unit, configured to control an equivalent impedance between the first end of the crystal oscillator and the second end of the crystal oscillator to be a first resistance value when the voltage at the first end of the crystal oscillator is greater than the voltage at the second end of the crystal oscillator in the maintenance phase; a second feedback unit, configured to control the equivalent impedance between the first terminal of the crystal oscillator and the second terminal of the crystal oscillator to be a second resistance value when the voltage at the first terminal of the crystal oscillator is less than the voltage at the second terminal of the crystal oscillator in the maintenance phase; The first feedback unit and the second feedback unit are also used together to control the equivalent impedance between the first end and the second end of the crystal oscillator to be a third resistance value during the oscillation start-up phase, and the third resistance value is greater than either the first resistance value or the second resistance value.
3. The oscillation circuit according to claim 2, wherein: The first feedback unit includes: a first transistor, wherein a first electrode of the first transistor is connected to the second feedback unit, a second electrode of the first transistor is connected to the first end of the crystal oscillator and the mirror amplification module, and a control electrode of the first transistor is connected to the second end of the crystal oscillator; A first intrinsic tube, wherein a first electrode of the first intrinsic tube is connected to the first electrode of the first transistor and the second feedback unit, a second electrode of the first intrinsic tube is connected to the second end of the crystal oscillator, and a control electrode of the first intrinsic tube is connected to the first end of the crystal oscillator.
4. The oscillation circuit according to claim 3, wherein: The second feedback unit includes: a second transistor, wherein a first electrode of the second transistor is connected to the first electrode of the first transistor and the first electrode of the first intrinsic transistor, a second electrode of the second transistor is connected to the second end of the crystal oscillator, and a control electrode of the second transistor is connected to the first end of the crystal oscillator; A second intrinsic transistor, wherein a first electrode of the second intrinsic transistor is connected to the first electrode of the second transistor, a second electrode of the second intrinsic transistor is connected to the first end of the crystal oscillator, and a control electrode of the second intrinsic transistor is connected to the second end of the crystal oscillator.
5. The oscillation circuit according to claim 1, wherein The feedback module includes: a first feedback unit, configured to control an equivalent impedance between the first end of the crystal oscillator and the second end of the crystal oscillator to be a first resistance value when the voltage at the first end of the crystal oscillator is greater than the voltage at the second end of the crystal oscillator in the maintenance phase; a second feedback unit, configured to control the equivalent impedance between the first terminal of the crystal oscillator and the second terminal of the crystal oscillator to be a second resistance value when the voltage at the first terminal of the crystal oscillator is less than the voltage at the second terminal of the crystal oscillator in the maintenance phase; A third feedback unit is used to control the equivalent impedance between the first end of the crystal oscillator and the second end of the crystal oscillator to be a third resistance value during the oscillation starting stage, and the third resistance value is greater than any one of the first resistance value and the second resistance value.
6. The oscillation circuit according to claim 5, wherein: The first feedback unit includes: a third transistor, wherein a second electrode of the third transistor is connected to the first end of the crystal oscillator and the mirror amplification module, and a control electrode of the third transistor is connected to the second end of the crystal oscillator; A fourth transistor, wherein a first electrode of the fourth transistor is connected to the first electrode of the third transistor, a second electrode of the fourth transistor is connected to the second end of the crystal oscillator, and a control electrode of the fourth transistor is connected to the first end of the crystal oscillator.
7. The oscillation circuit according to claim 5, wherein: The second feedback unit includes: a fifth transistor, wherein a first electrode of the fifth transistor is connected to the first end of the crystal oscillator, and a control electrode of the fifth transistor is connected to the second end of the crystal oscillator; A sixth transistor, wherein a first electrode of the sixth transistor is connected to the second end of the crystal oscillator, a second electrode of the sixth transistor is connected to the second electrode of the fifth transistor, and a control electrode of the sixth transistor is connected to the first end of the crystal oscillator.
8. The oscillation circuit according to claim 5, wherein: The third feedback unit includes: at least one third intrinsic transistor, the at least one third intrinsic transistor being connected in series between the first end of the crystal oscillator and the second end of the crystal oscillator, the first electrode of each third intrinsic transistor being connected to its own control electrode, the first electrode of one third intrinsic transistor being connected to the first end of the crystal oscillator or the second electrode of another third intrinsic transistor, and the second electrode of one third intrinsic transistor being connected to the second end of the crystal oscillator or the first electrode of another third intrinsic transistor; At least one fourth intrinsic tube is connected in series between the first end of the crystal oscillator and the second end of the crystal oscillator, the first electrode of each fourth intrinsic tube is connected to its own control electrode, the first electrode of one fourth intrinsic tube is connected to the second end of the crystal oscillator or the second electrode of another fourth intrinsic tube, and the second electrode of one fourth intrinsic tube is connected to the first end of the crystal oscillator or the first electrode of another fourth intrinsic tube.
9. A chip, characterized in that: The chip includes the oscillation circuit according to any one of claims 1 to 8.
10. An electronic device, characterized in that: The electronic device includes a device body and the chip according to claim 9 provided in the device body.